diff --git a/mm/rmap.c b/mm/rmap.c
index 75a32be..304f519 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -505,6 +505,7 @@
 
 	return ret;
 }
+EXPORT_SYMBOL_GPL(page_mkclean);
 
 /**
  * page_set_anon_rmap - setup new anonymous rmap